Basically this is the equation:
Higher Resolution = Higher pixel density = Higher fidelity and better looking and more sharp graphics.
Just don't forget that higher resolutions demands more "horse power" from your GPU and CPU to render it with good FPS. This means you need very good and powerful hardware if you plan on playing at resolutions higher then 1080p.
The main goal is always find the sweet spot between performance and graphic quality because you don't want to play 4K games at 15 FPS just as you don't want to play 720P quality at 300 FPS.
Another important consideration when buying new monitor is the refresh rate of it. For gaming - 144hz is a must (imo).
http://www.tomshardware.com/forum/id-1845694/144hz-monitor-worth.html

Just wondering why in some cases players have this folder and some won't ? Is it GPU (AMD/NVIDIA) related ? I'm asking this question because my little brother also play Squad on his PC (amd gpu) and he had the same issue as OP described while on my PC (Nvidia gpu) I never had this error or folder in my Squad's folder.
Any clarification would be much appreciated.